I had a few users in the past, having some weird issues and I got permission to examine their servers.
It seems some of you don't run netconfig or netconfig-lcd (recommended) and try to manually
edit the /etc/hosts file, which is no problem, unless you do it right.

I don't know where those users got he information, but they all had a line in /etc/hosts with

127.0.0.1 localhost localhost.domain example example.org

The above config makes localhost non resolvable, and services like sqlgrey fail to start, resulting to a dead mail server.

The proper way is by adding your IP local or external if there is no NAT.

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